# 4.   Find the sum of :            (a)             (b)             (c)             (d)

It is known that the sum of .

Therefore,
(a) the sum of
= 137 + (-137) + (- 217)
= - 217

(b) the sum of
=  -52 + 52 = 0

(c) the sum of
= (- 231) + (81) + (39 + 192 )
= (- 81) + (- 231) + (231)
= - 81

(d) the sum of
= - (50 + 200 ) + (300)
= - 250 + (250) + 50
= 50

_52 and 56

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