1.

The 10th and 20th term of an ap are 73 and 143 find the first term.​

Answer»

Answer:

a+9D = 73

a+19d = 143

now, by ELIMINATION METHOD.

10d = 70

d = 7

put VALUE in any eq.

a + 9d = 73

a + 9×7 = 73

a + 63 = 73

a = 73 - 63

a = 10



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