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If the difference between 10 term of two A.P. is 10 the find the difference between their 20 terms |
| Answer» Let first term and answer difference of 1st ap = a and d ,And first term and difference of 2nd ap =A and D , Now , a10 - A10 = 10 a + 9d -(A + 9 D ) =10 a+9d-A-9D =10 a-A= 10.......(1) Now, a20-A20 a+19d-(A+19D) a+19d-A-19D a-A And we know , a-A=10 ( find in equation (1)) So, a - A = 10 is answer 10 is the difference between their 20th term | |