Question

find the sum of 10 terms of an ap -37, -33, -29......
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Answer 1

$a = -37\\d = 4 \\n=10\\\\ to \:find , \\sum\:of\:terms = n/2[ 2a + (n-1)d]\\ = 10/2[2*-37 + (10-1)4]\\ = 5 [ - 64 + 36] \\ = -140\\\\\huge\pink{Hope\:it\:helps\:you}$