n સંખ્યાઓનો સરવાળો શોધવાનું સૂત્ર
n Find the sum of numbers
(A) n/2(a + 1)
(B) {n/2(a + n – 1)d}
(C) a + (n - 1)d
(D) 2a + (n – 1)d
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tfhhu
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