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(B) Step $1$: Subtract $1$ from the last digit of each number.$972 \rightarrow 97(2-1) = 971$$526 \rightarrow 52(6-1) = 525$$487 \rightarrow 48(7-1) =

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(B) Step $1$: Subtract $1$ from the last digit of each number.$972 \rightarrow 97(2-1) = 971$$526 \rightarrow 52(6-1) = 525$$487 \rightarrow 48(7-1) = 486$$359 \rightarrow 35(9-1) = 358$$251 \rightarrow 25(1-1) = 250$Step $2$: Calculate the sum of the digits for each resulting number.Sum of digits of $971 = 9 + 7 + 1 = 17$Sum of digits of $525 = 5 + 2 + 5 = 12$Sum of digits of $486 = 4 + 8 + 6 = 18$Sum of digits of $358 = 3 + 5 + 8 = 16$Sum of digits of $250 = 2 + 5 + 0 = 7$Step $3$: Identify which sums are prime numbers.The sums are $17, 12, 18, 16, 7$.Among these,$17$ and $7$ are prime numbers.Therefore,there are $2$ such numbers.

The following questions are based on the five three-digit numbers given below:
$972, 526, 487, 359, 251$
If $1$ is subtracted from the last digit of each of the above numbers,the sum of the digits of how many of them are prime numbers?

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The following questions are based on the five three-digit numbers given below:$972, 526, 487, 359, 251$If $1$ is subtracted from the last digit of each of the above numbers,the sum of the digits of how many of them are prime numbers?

Similar Questions

One term in the number series is wrong. Find it.$1, 5, 14, 30, 55, 93$

Fill in the blank space for the given series with the correct alternative.$3, 4, 7, 7, 13, 13, 21, 22, 31, 44, (\ldots)$

Choose the correct alternative answer $a...bbbc...aab....cca....bbcc$

Study the following arrangement carefully and answer the question.$O, 4, E, J, 5, T, 1, A, M, Q, 3, 8, N, I, K, 7, W, F, 6, S, 9, U, 2, Y, X$Which of the following is exactly in the middle between $A$ and $S$ in the above arrangement?

Fill in the blank space for the given series with the correct alternative.$66, 36, 18, (\ldots)$