Question

The fourth term of an AP is 11.the sum of the fifth and seventh term of anAP is 24.find common differences

Answer 1

Answer: d=0.5

Step-by-step explanation: fourth term = 11

a+3d=11   since tn= a+(n-1)d;

now 5 th term + 7 th term = 24

a+4d+a+6d=24;   2a+10d=24;    a+5d=12;    

solve a+3d=11 and a+5d=12;

we get subtract 2nd equation from 1st equation then we get

2d=1; d=0.5

Answer 2

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