Question

Find the sum of the first 10 terms of the A.P -6, -3.0, 3. 6.
अमोल दी । 3, 6......... के प्रथम 10 पदों का योग ज्ञात कीजिए​

Answer 1

Hey

Given :-

a = -6

d = -3+6 = 3

n = 10

sn = n/2 {a+(n-1)d}

s10 = 10/2 {-6+(10-1)3}

= 5 {-6+27}

= 5 x 21

= 105