The sum of the 4thand 8thterm of an AP is 28and the sum of the 6thand 10thterm is 48. Find the AP.Also find the sum of first 20 terms.
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20th term =
an = a + (n -1) × d
an = -11 + (20 - 1) × 5
an = -11 + 19 × 5
an = -11 + 95
an = 84
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