1.

The sum of 1st 7 term of a ap is 77.find the 4th term

Answer»

SOLUTION....

Sn = n/2 [2A+(n-1)d]
where,
n= 7 ,Sn = 77, a = first term and d = common difference.

S7 = 7/2 [ 2a + (7-1)d]
77 = 3.5 [2a + 6D]
77/3.5 = 2a + 6d
22 = 2a + 6d

☞ a + 3d = 11.
☞ a4 = 11.

Hence the fourth term is 11.

Hope this will HELP you.....☺☺


☛ ⛧⛧ Mr. THAKUR ⛧⛧



Discussion

No Comment Found

Related InterviewSolutions