which term of the Ap 3,10,17...will be 84 more than it's 13th term
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The answer is "25th term"
Step-by-step explanation:
The A.P = 3,10,17....
To find out the nth term Tn= a + (n-1) d is the formula used.
here, a = T1= 3.
difference ( d ) = 7
T13 = 3 + ( 13-1) 7
= 3 + 12 * 7
= 3 + 84
T13 = 87.
The question is Tn = T13 + 84
Tn = 87 + 84
Tn = 171 = a + (n-1) d
171 = 3 + ( n - 1 ) 7
171 - 3 = 7 (n-1 )
168/7 = n- 1
24 = n-1
n = 24 + 1
n = 25
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